Question

In two wires A and B ratio of
number of electrons per unit
volume is 2:3 ratio of drift
velocities is 3:2 iratio of radius
1:2 Then ratio of current
flow in A and B is​

Answer 1

Answer:

v

d

1

​

​

​

=

1

4×4

​

=

1

16

​

Hence correct answer is option A.

Answer 2

Answer:

current= number of electrons per unit volume ×charge on particle ×area of cross area of wire ×driftvelocity

that is I^1 / I^2 =2/3×3/2×1/2×charge/charge=1/2